(6) Eye Hortilux 600W Super HPS Hydroponics Enhanced Spectrum Grow Light Bulbs Optimizes spectral energy levels that promote vigorous plant growth Provides 17% more total energy and 25% more energy in the violet, blue, and green spectrum than standard high pressure sodium lamps Environmentally friendly and pass EPA TCLP test criteria as non-hazardous waste Completely lead-free and contain less mercury than standard HPS lamps 600W High Pressure Sodium Grow Lamp